Luke 2:43-45

New International Version

⁴³ After the festival was over, while his parents were returning home, the boy Jesus stayed behind in Jerusalem, but they were unaware of it. ⁴⁴ Thinking he was in their company, they traveled on for a day. Then they began looking for him among their relatives and friends. ⁴⁵ When they did not find him, they went back to Jerusalem to look for him.